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Income Taxes - Schedule of Components of Provision (Benefit) for Income Taxes (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current:      
Federal   $ (736)  
State $ 231 156 $ 172
Foreign 911 396 137
Current, Total 1,142 (184) 309
Deferred:      
Federal     (55)
Foreign (55) (172) (23)
Deferred Income Tax Expense (Benefit) (55) (172) (78)
Provision (benefit) for income taxes $ 1,087 $ (356) $ 231